21002199999 has 48 divisors (see below), whose sum is σ = 31502572416. Its totient is φ = 12342844800.

The previous prime is 21002199989. The next prime is 21002200097. The reversal of 21002199999 is 99999120012.

It is not a de Polignac number, because 21002199999 - 2⁴ = 21002199983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002199929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17934684 + ... + 17935854.

It is an arithmetic number, because the mean of its divisors is an integer number (656303592).

Almost surely, 2^21002199999 is an apocalyptic number.

21002199999 is a deficient number, since it is larger than the sum of its proper divisors (10500372417).

21002199999 is a wasteful number, since it uses less digits than its factorization.

21002199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656 (or 1619 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 51.

The spelling of 21002199999 in words is "twenty-one billion, two million, one hundred ninety-nine thousand, nine hundred ninety-nine".